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CVE-2026-43929— ssrfcheck: Server-Side Request Forgery (SSRF) and Incomplete List of Disallowed Inputs

Quick assessment

Affected
felippe-regazio ssrfcheck
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SSRF Check是Felippe Regazio个人开发者的一个检查字符串是否包含潜在的SSRF攻击。 SSRF Check 1.3.0及之前版本存在安全漏洞，该漏洞源于无法阻止IPv4映射IPv6地址格式的服务器端请求伪造攻击。

CVSS 8.2 · High EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
felippe-regazio ssrfcheck <= 1.3.0 affected
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I. Basic Information for CVE-2026-43929

Vulnerability Information
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Vulnerability Title
ssrfcheck: Server-Side Request Forgery (SSRF) and Incomplete List of Disallowed Inputs
Source: CVE Program / CVE List V5
Vulnerability Description
ssrfcheck is a library that checks if a string contains a potential SSRF attack. In 1.3.0 and earlier, ssrfcheck fails to block Server-Side Request Forgery attacks when the target private IP address is encoded as an IPv4-mapped IPv6 address (e.g. http://[::ffff:127.0.0.1]/). The WHATWG URL parser built into Node.js silently normalizes the IPv4 notation inside the brackets to compressed hex form ([::ffff:7f00:1]) before the library's private-IP regex ever runs. The regex was written to match dot-notation only and therefore never matches any real input — all seven IANA private IPv4 ranges, including the AWS/GCP/Azure metadata address 169.254.169.254, are bypassed. Any application using isSSRFSafeURL() to guard HTTP requests made with user-supplied URLs is fully exposed to SSRF.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5
Vulnerability Title
SSRF Check 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SSRF Check是Felippe Regazio个人开发者的一个检查字符串是否包含潜在的SSRF攻击。 SSRF Check 1.3.0及之前版本存在安全漏洞，该漏洞源于无法阻止IPv4映射IPv6地址格式的服务器端请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
felippe-regazio ssrfcheck <= 1.3.0 -

II. Public POCs for CVE-2026-43929

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III. Intelligence Information for CVE-2026-43929

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Vendor Advisories for CVE-2026-43929 (1)

IV. Related Vulnerabilities

Same product: ssrfcheck
Same weakness: CWE-184

V. Comments for CVE-2026-43929

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